CBTM03090 | Payments: Fractional amounts of benefit or allowance
From HM Revenue & Customs · Child Benefit Technical Manual
Child Benefit and Guardian’s Allowance (Administration) Regulations 2003,regulation 24
If the amount of Child Benefit or Guardian’s Allowance payable includes a fractionof a penny:
the fraction should be disregarded if it is less than a half
the fraction should be treated as a whole penny if it is half or more